Portable grinder assembly



1957 l w. L. BOUTWE'LL, SR 2,808,684

PORTABLE GRINDER AssEMLY Filed June 12. 1956 INVENTOR.

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BY I

ymw 8W ATTdZ/VEYS United States Patent PORTABLE GRINDER ASSEMBLY Willis L. Butwell,Sr., Mobile, Ala.

Application June 12, 1956,'Serial N 0. 590,928

1 Claim. (Cl. 51-109) This invention relates generally to tool sharpening apparatus and is more particularly concerned with a novel portable grinder assembly especially usable by barbers and the like wherein the blades of clippers may be sharpened as well as the blades of shears and the like, said assembly including an attachment incorporating a grind-stone wherein the edges of chisels, screw drivers and the like may be readily sharpened.

A primary object of invention is to provide a novel portable grinder assembly which may be readily secured in vertically extending relationship from a support surface, said assembly including a support member rotatably supporting a horizontally disposed grinder disc and including means for rotating the same, said disc accommodating on the upper surface portion thereof a suitable grinding compound wherein the blades of clippers and the like may be sharpened, and further including a grindstone attachment assembly which is carried on the support member including friction drive means engaged with an undersunface portion of the drive disc being resiliently urged into contact therewith, said grind-stone attachment assembly incorporating a grind stone rotatable on an axis of rotation substantially normal to that of the grinder disc.

A further object of invention in conformance with that set forth is to provide a novel portable grinder assembly which is readily and economically manufactured, easily used and maintained, and highly satisfactory, serviceable and acceptable for the purpose intended.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is an elevational view of the novel portable grinder assembly, showing the same mounted on an edge portion of a vertical support surface shown fragmentarily;

Figure 2 is a fragmentary sectional view taken substantially on line 22 of Figure 1; and

Figure 3 is a fragmentary sectional view taken substantially on line 3-3 of Figure 1.

Referring to the drawing in detail, a fragmentary portion of a horizontal support surface is indicated generally at 10 and disposed over an edge portion 12 of said support surface is a portable grinder assembly indicated generally at 14.

The grinder assembly 14 includes a support member indicated generally at 16 which includes an inverted L- shaped bracket member having an upper leg portion 18 disposed substantially parallel to the upper surface of the support member 10. Integral with the leg member 18 is a vertical leg member 20 which has suitably secured on the lower end portion thereof, by means of welding, for example, a C-clamp assembly indicated generally at 22. Extending transversely through opposite sides of the vertical leg member 20 is a suitable tubular support sleeve r 2,808,684 Ce Patented Oct. 8., 1957 '2 24 which has journaled therein a drive-shaft 26,-one end of the shaft 26 being secured .to a laterally extending operating handle ,assernbly 28, the other end of said shaft 26 being suitablysecuredto averticallyextending bevel drive gear 30. .Thehorizontal.leg member 18,has extending transversely .therethrough ,a suitable support sleeve 32 which has journaled therein ashaft 34, one end of ,said shaft having suitably .secured thereon a driven bevel gear 36 which is in driving: engagement with the bevel drive gear 30, theother end, .ofsaidshaft 34. having suitably secured ,between clamping nuts '38 and .40.. .a

grinder disc .42 which ,is constructed. of .any suitable material, stainless ,steel or the .like. Rotationuof the handle assembly28,wil1}acc,ordingly cause rotation of the grinder disc.,42. .Theupperisufiace ofthegrindendisc 42 is substantially uninterrupted andwill have deposited thereon a suitable grinding compound such as marble chips, emery dust or the like wherein the blade of a pair of barbers clippers, for example, may be readily sharpened.

Indicated generally at 44 is a grind-wheel attachment assembly which includes a support bracket indicated generally at 46 comprising a pair of arm members 48 and 50, see Figure 2, said arm members having extending transversely through oppositely disposed aligned aperture portions a bolt assembly 52 incorporating a wing nut element 54 providing for ready removal and installation of the grind-wheel attachment assembly, said bolt assembly 52 extending through a suitable journal sleeve 56 suitably secured on leg portion 20 of the support member 16. The arm portion 50 includes an upwardly extending terminal end portion 58 which extends beyond the journal sleeve 56, said portion 58 being suitably apertured and having secured thereto one end of a V tension spring member 60, the other end of said tension spring member being suitably secured through a suitably apertured portion on the lower end of the arm portion 20 of the support member 16. Thus the tension spring member 60 tends to urge the support bracket 46 about the bolt assembly 52 toward the under surface of the grinder disc 42.

Suitably secured in angular relationship from the opposite ends of the support arms 48 and 50 is a journal block element 62 having suitably journaled therein a transversely disposed grind-wheel support shaft 64, said shaft 64 having suitably secured thereon between clamp nuts 66 and 68 a grind-wheel or emery stone 70 which will be rotated with the grind-wheel support shaft 64. The grind-wheel support shaft 64 is disposed substantially normal to the previously described support shaft 34 of the grinder disc 42. Suitably secured on an intermediate portion of the shaft 64 is a drive wheel 72 which includes a peripheral friction surface portion 74 thereabout, said friction surface portion 74 being in frictional contact and driving engagement with an undersurface portion of the grinder disc 42. The tension spring 60 urging the sup port bracket 46 in a counter-clockwise direction thus urges the drive wheel 7-2 into driving engagement with the grinder disc.

It will be noted that the grinder disc 42 may be utilized exclusive of the grind-wheel attachment assembly.

Thus there has been disclosed a novel portable grinder assembly which fully conforms with the objects of invention heretofore set forth.

Various positional directional terms such' as upper, lower, etc., are utilized herein to have only relative connotation to aid in describing the device and it is not intended to require any particular orientation with respect to any external elements.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claim.

What is claimed is: V a

In a portable grinder assembly for small tools and the like comprising a support member, means on one end of the support member for clamping the support member in vertically extending relationship from a horizontal support surface, a support shaft journaled on the support member normal to an upper end portion thereof, power means on the support member in operative engagement with the support shaft for rotating the same, and a grinder disc secured on an upper end portion of the support shaft for rotation therewith in a horizontal plane for receiving a grinding compound on theupper surface thereof for sharpening blade edges and the like; a grind-wheel attachment assembly removably received on the support member including a support bracket intermediatelypivoted on the support member, tension spring means engageable' between one end portion of the support bracket urging the other end portion thereof toward the lower surface of the grinder disc, a grind-wheel support shaft journaled on the other end portion of the support bracket substantially normal to the axis of rotation of the grinder disc and in underlying relationship beneath said grinder disc, a drive wheel secured on an intermediate portion of the grinder-wheel support shaft and including a peripheral friction surface resiliently urged into driving engagement with the under surface of the grinder disc by said tension spring, and a grind-whee] secured on a terminal end portion of the grind-wheel support shaft.

References Cited in the file of this patent UNITED STATES PATENTS 1,077,306 Root Nov. 4, 1913 w Na 

